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We played around with rocker ratios on a computer simulation of a TR4 engin=
e. =C2=A0The added lift increased max HP by about 3 HP peak. =C2=A0Low end =
(under about 3500 rpm) torque was actually reduced a very small amount. =C2=
=A0If the TR6 results were similar, probably not worth the hassle of added =
valve spring issues and reduced valve guide length (greater valve guide wea=
r).
For what it's worth....
Phil
-----Original Message-----
From: van.mulders.marcel--- via Fot <fot@autox.team.net>
To: Michael Zbarsky <mzbarsky@yahoo.com>
Cc: fot <fot@autox.team.net>
Sent: Mon, Feb 10, 2020 8:52 am
Subject: Re: [Fot] Camshaft recommendation
I also once bought a Goodparts 1.65 rocker roller assembly for a TR6 engine=
, but in the end I had to use a 1.55 roller rocker assembly, also from Good=
parts, because, with the 1.65, it is difficult to find a race camshaft with=
a=C2=A0 lobe lift that is low enough. With lobes of 8mm or higher, I could=
not find valve springs to cope with the high valve lift. I bought a G5 cam=
shaft from Schneider, they call it=C2=A0 the 320-F grind (duration is 268=
=C2=B0 at 0.050", timing is 57-83=C2=A0 =C2=A0 87-53 , installation figure =
is then 103=C2=B0 :is that the same as the G5 grind?) with 0.340"/8.6mm cam=
lift and that makes for a=C2=A0 valve lift of 12.9mm with the 1.55 rocker =
arms. With 1.65 rockers , valve lift would be 14.2mm and I could not find v=
alve springs for that lift. The valve springs I used are part no 281003-063=
.20 from Summit (Isky), 320lb/inch spring rate. They recommend 0.45"/11.43m=
m=C2=A0 (1.250" - 0.800"from closed to full open position, so it is about 1=
.4mm more in my engine, but there is no problem concerning=C2=A0 coil bindi=
ng : the installed height is a 1mm more than 1.250 , the pressure in closed=
position is lower=C2=A0 of course, but still 34kgs (105kgs at full lift) a=
n that seems to be enough till 7500 rpmRacetorations have a race cam with 7=
.6mm cam lift, probably that would work with 1.65 rocker arms. I still have=
the 1.65 rocker assembly, it is new and it could work with a road cam or a=
ny camshaft with a maximum of 8mm cam lift.Marcel
Van: "fot" <fot@autox.team.net>
Aan: "fot" <fot@autox.team.net>
Verzonden: Maandag 10 februari 2020 02:34:27
Onderwerp: [Fot] Camshaft recommendation
Hi all, I=E2=80=99m building a TR6 race engine and have a set of 1.65 ratio=
roller rockers from Goodparts. Any recommendations for a suitable camshaft=
? I will be putting in cam bearings.=C2=A0
Thanks, Mike
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
arcel@telenet.be
_______________________________________________
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Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
com
------=_Part_594103_1385196788.1581343503173
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<div style=3D"color:black;font: 10pt arial;">We played around with rocker r=
atios on a computer simulation of a TR4 engine. The added lift increa=
sed max HP by about 3 HP peak. Low end (under about 3500 rpm) torque =
was actually reduced a very small amount. If the TR6 results were sim=
ilar, probably not worth the hassle of added valve spring issues and reduce=
d valve guide length (greater valve guide wear).
<div><br>
</div>
<div>For what it's worth....</div>
<div><br>
</div>
<div>Phil<br>
<br>
<br>
<div style=3D"font-family:helvetica,arial;font-size:10pt;color:black">-----=
Original Message-----<br>
From: van.mulders.marcel--- via Fot <fot@autox.team.net><br>
To: Michael Zbarsky <mzbarsky@yahoo.com><br>
Cc: fot <fot@autox.team.net><br>
Sent: Mon, Feb 10, 2020 8:52 am<br>
Subject: Re: [Fot] Camshaft recommendation<br>
<br>
<div id=3D"yiv7723969363">
<div>
<div style=3D"font-family:Verdana, Arial, Helvetica, sans-serif;font-size:1=
0pt;color:#000000;">
<div>I also once bought a Goodparts 1.65 rocker roller assembly for a TR6 e=
ngine, but in the end I had to use a 1.55 roller rocker assembly, also from=
Goodparts, because, with the 1.65, it is difficult to find a race camshaft=
with a lobe lift that is low enough. With lobes of 8mm or higher, I =
could not find valve springs to cope with the high valve lift. I bought a G=
5 camshaft from Schneider, they call it the 320-F grind (duration is =
268=C2=B0 at 0.050", timing is 57-83 87-53 , installation figu=
re is then 103=C2=B0 :is that the same as the G5 grind?) with 0.340"/8.6mm =
cam lift and that makes for a valve lift of 12.9mm with the 1.55 rock=
er arms. With 1.65 rockers , valve lift would be 14.2mm and I could not fin=
d valve springs for that lift. The valve springs I used are part no 281003-=
063.20 from Summit (Isky), 320lb/inch spring rate. They recommend 0.45"/11.=
43mm (1.250" - 0.800"from closed to full open position, so it is abou=
t 1.4mm more in my engine, but there is no problem concerning coil bi=
nding : the installed height is a 1mm more than 1.250 , the pressure in clo=
sed position is lower of course, but still 34kgs (105kgs at full lift=
) an that seems to be enough till 7500 rpm</div>
<div>Racetorations have a race cam with 7.6mm cam lift, probably that would=
work with 1.65 rocker arms. I still have the 1.65 rocker assembly, it is n=
ew and it could work with a road cam or any camshaft with a maximum of 8mm =
cam lift.</div>
<div>Marcel</div>
<div><br clear=3D"none"></div>
<hr id=3D"yiv7723969363zwchr">
<div class=3D"yiv7723969363yqt1883404066" id=3D"yiv7723969363yqtfd49773">
<div><b>Van: </b>"fot" <fot@autox.team.net><br clear=3D"none"><b>Aan:=
</b>"fot" <fot@autox.team.net><br clear=3D"none"><b>Verzonden: </b>M=
aandag 10 februari 2020 02:34:27<br clear=3D"none"><b>Onderwerp: </b>[Fot] =
Camshaft recommendation<br clear=3D"none"></div>
<div><br clear=3D"none"></div>
</div>
<div>
<div class=3D"yiv7723969363yqt1883404066" id=3D"yiv7723969363yqtfd09093">
Hi all, I=E2=80=99m building a TR6 race engine and have a set of 1.65 ratio=
roller rockers from Goodparts. Any recommendations for a suitable camshaft=
? I will be putting in cam bearings.
<div><br clear=3D"none">
<div>Thanks, Mike<br clear=3D"none"><br clear=3D"none"><br clear=3D"none"><=
/div>
</div>
<br clear=3D"none">_______________________________________________<br clear=
=3D"none">fot@autox.team.net<br clear=3D"none"><br clear=3D"none">http://ww=
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am.net/donate.html<br clear=3D"none">Archive: http://autox.team.net/archive=
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s/fot/van.mulders.marcel@telenet.be
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